The highly-rated defender suffered a serious facial injury in Celtic’s 2-0 win over St Johnstone at the weekend.
Celtic boss Neil Lennon told BBC Scotland: “It looks like a fractured cheekbone. It could be a fractured eye-socket.
“It’ll have to be scanned and assessed, but it’s a massive blow for us.
“He could be out for four to six weeks, but we’ll see how he is before we give him a definitive time out.”
